Which of the following is a part of an observational study?
a)control of all variables
b)manipulation of participants
c)collection of data
d)inclusion of bias

Collection of data is the part of an observational study.

Option: (c)

Explanation:

carbon atoms, hydrogen, oxygen, and nitrogen.

homeostasis is the tendency towards a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes. and this is how it applies to the integumentary system. back to top. skin functions in homeostasis include protection, regulation of body temperature, sensory reception, water balance, synthesis of vitamins and hormones, and absorption of materials. when body temperature falls, the sweat glands constrict and sweat production decreases.